The Pulley,groove, cataloged under National Stock Number 3020-00-889-5604, is classified within Federal Supply Class 3020 (Gears, Pulleys, Sprockets, and Transmission Chain) of the Mechanical Power Transmission Equipment group. The manufacturer of record is TB Woods's Corporation. Government technical data includes 29 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 3020-00-889-5604 |
| Primary Part Number | 2BK501 1/8 |
| Item Name | Pulley,groove |
| FSC / FSG | 3020 / 30 — Gears, Pulleys, Sprockets, and Transmission Chain |
| Manufacturer | TB Woods's Corporation |
| Status | ACTIVE |
| Integral Cooling Vane | NOT INCLUDED |
| Hub Outside Diameter | 2.500 INCHES NOMINAL AA END IN |
| Bore Feature | INCLUDED |
| Securing Method | SETSCREW |
| Split Hub Feature | NOT INCLUDED |
| Bore Length | 1.625 INCHES NOMINAL IN |
| Design Form | WEBBED |
| Web/spoke Relationship to Face Centerline | OFFSET |
| Groove Shape | V |
| Standard V-Belt Section Designation for Which Designed | 5L |
| Outside Diameter | 4.800 INCHES NOMINAL IN |
| Keying Facility Type | KEYWAY |
| Quantity | 1 |
| Style Designator | WEBBED OR SPOKED |
| Material Document and Classification | QQ-I-652, CLASS 20 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Pitch Diameter | 4.400 INCHES NOMINAL IN |
| Groove Depth | 0.625 INCHES NOMINAL IN |
| Bore Type | STRAIGHT |
| Bearings | NOT INCLUDED |
| Groove Quantity | 2 |
| V Groove Angle in Deg | 34.0 |
| Protruding Hub Characteristic | PLAIN |
| Distance From Center of Bore to Bottom of Keyway | 1.250 INCHES MINIMUM AND 1.255 INCHES MAXIMUM IN |
| Keyway Width | 0.249 INCHES MINIMUM AND 0.251 INCHES MAXIMUM IN |
| Unable to Decode | UNABLE TO DECODE |
| Surface Treatment | PAINT |
| Distance From Outside Flange/rim to Hub End and Location | 0.625 INCHES NOMINAL AA END AND 0.750 INCHES NOMINAL BB END IN |
| Counterbore Feature | NOT INCLUDED |
| Bore Diameter | 0.125 INCHES MINIMUM AND 0.126 INCHES MAXIMUM IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 2BK501 1/8 PRIMARY | TB Woods's Corporation (USA) |
| Reference | Meaning |
|---|---|
| D4480-1-1-8 | 5/9 Secondary reference TB Woods's Corporation |
| 9975939 | 7/2 Vendor item drawing reference Us Army Aviation and Missile Command |
NSN 3020-00-889-5604 is a Pulley,groove, manufactured by TB Woods's Corporation, classified under FSC 3020, Gears, Pulleys, Sprockets, and Transmission Chain. Status: active.
NSN 3020-00-889-5604 has 1 manufacturer part number on file: 2BK501 1/8 (TB Woods's Corporation).
1 possible match (shared part number, not a government interchangeability claim): 3020-01-154-1359. Verify interchangeability with system specifications before substitution.
Key specifications for 2BK501 1/8: Integral Cooling Vane: NOT INCLUDED; Hub Outside Diameter: 2.500 INCHES NOMINAL AA END IN; Bore Feature: INCLUDED; Securing Method: SETSCREW. 29 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.